100231021 has 4 divisors (see below), whose sum is σ = 109342944. Its totient is φ = 91119100.

The previous prime is 100231009. The next prime is 100231063. The reversal of 100231021 is 120132001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 100231021 - 2¹⁷ = 100099949 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100230989 and 100231007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100231121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4555945 + ... + 4555966.

It is an arithmetic number, because the mean of its divisors is an integer number (27335736).

Almost surely, 2^100231021 is an apocalyptic number.

100231021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

100231021 is a deficient number, since it is larger than the sum of its proper divisors (9111923).

100231021 is an equidigital number, since it uses as much as digits as its factorization.

100231021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9111922.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 100231021 is about 10011.5443863572. The cubic root of 100231021 is about 464.5160432955.

Adding to 100231021 its reverse (120132001), we get a palindrome (220363022).

It can be divided in two parts, 1002 and 31021, that added together give a palindrome (32023).

The spelling of 100231021 in words is "one hundred million, two hundred thirty-one thousand, twenty-one".